CVE-2024-24814

mod_auth_openidc is an OpenID Certified™ authentication and authorization
module for the Apache 2.x HTTP server that implements the OpenID Connect
Relying Party functionality. In affected versions missing input validation
on mod_auth_openidc_session_chunks cookie value makes the server vulnerable
to a denial of service (DoS) attack. An internal security audit has been
conducted and the reviewers found that if they manipulated the value of the
mod_auth_openidc_session_chunks cookie to a very large integer, like
99999999, the server struggles with the request for a long time and finally
gets back with a 500 error. Making a few requests of this kind caused our
server to become unresponsive. Attackers can craft requests that would make
the server work very hard (and possibly become unresponsive) and/or crash
with minimal effort. This issue has been addressed in version 2.4.15.2.
Users are advised to upgrade. There are no known workarounds for this
vulnerability.